.github: Set rocm workflows to only run on PRs (#71567)
Summary:
Also adds a mechanism for all workflows to do this
Signed-off-by: Eli Uriegas <eliuriegasfb.com>
cc jeffdaily sunway513 jithunnair-amd ROCmSupport KyleCZH
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71567
Reviewed By: malfet
Differential Revision: D33687713
Pulled By: seemethere
fbshipit-source-id: a3c7ef41ed04f9caa82c180961d2f4b7c24582dd
(cherry picked from commit eef2eafffd4c6311eff73d86fffaa42460cd2603)
